Dbier-heatihg system



W. B. FULTON.

DRIER HEATING SYSTEM.

APPLICATION FILED OCT-1, 1919.

1,380,373, Pa't entedJuhe 7,1! 21.

W/zZ/AM 5. F01 722M Witness: Inventor "'1 W S w,

Attorney.

45 tively high-pressure steam to these driers:

wnmivi in. semen, or riinnnn'rown, OHIO.

nninn-nnnrnve SYSTEM.

T all whom it may concern:

' the following is a specification.

This invention pertains to improvements in systems for heating driers.It is especially applicable to rotary drying cylinders employed indrying the web in. the

process of paper making, and I have chosen such a paper machine drierfor illustration.

The invention will be readily understood from the following descriptiontaken in connection with the accompanying drawing in which i 1 Figure 1is a diametrical section of a .part of an exemplifying cylindrical paperdrier: and y r Fig. 2 an end elevation of two series of such driersshown in connection with a system exemplifying my present invention. Inthe drawing, referring to Fig. 1:-' '1, indicates the shell of anvordinary rotary paper machine drier: v

2, the steam inlet thereto: and 2 3, the water outlet therefrom.

In theordinary construction, exemplified in Fig. 1, the heating steamenters and the water of condensation leaves at: the same end of thedrier, which is quite usual, and my present improvements, when employedin connection with paper machine driers, V

contemplate either that the steam may enter at one end of the drier andthe water of condensation leave at its other end, or that the entry ofsteam and the departure of condensation water may take place at the sameend of the drier.

Proceeding with the drawing 4:, indicates a secondary group of thedriers, the group being illustrated as containing two driers:

5, a supply-pipe for conveying compara- 6, a discharge-pipe forconveying steam at lowered pressure, as well as the water of condensation'from these driers:

7 a receiver:

8, a pipe placing the upper portion of the receiver in connection withthe discharge 6 of the secondary driers:

9, a primary group of driers, the group being illustrated as containingtwo driers:

Y Specification of Letters Patent.

' primary driers Patented June 7, 1921.

Application filed October 1, 1919. Serial No. 327,783. a

10, supply-pipe placing the upper part of the receiver in communicationwith the primary driers 9: a 3:

11, a discharge-pipe connected with the primary driers '9 for conveyingfrom them their contents consisting of vapor at reduced or zeropressure,as well as air and the water of condensatlon:

12, a suction device, illustrated as a pump:

13, a pipe placing the suction device in connection with the dischargepipe 11 of the 14, a condenser, which be of either 1- D-S A E AT NT-onon..- 3

the surface or jet type, disposed in pipe 13:

1 5, steam traps, of any usual character, CllSPOSGCl' in the'individualdischarge pipes of the primary driers 9:

15 by-pass pipes around the steam traps 15 15- a valve in each of theseby-pass pipes;

V 16, an assumed water-level in the re ce1ver: I

17, a float-valve disposed within and controlled by the level of waterin the receiver and adaptedto be opened by the rising of the float:

18, a pipe placing the'fioat valved? in communication with thesuctiondevice: 12:

19, a pipe placing the upper portion of the receiver inconnection-withthe suction device 12:

20, a check-valve in pipe 19 opening away from the receiver 2]., astop-valve in pipe 19: 22, the stem of this stop-valve:

23,-a diaphragm connected with this stem:

paratively high pressure. 7, This steai'n heats the driers 4 and, byparting with heat, be-

comes reduced in pressure and, along with the water condensed in thesedriers, goesthrough pipe 8 to the receiver 7, water of condensation,entrained inthe steam discharged from these driers, falling to the baseofthe where its accumulation will eventually cause it to stand at thelevel 16. p

The steam at reduced pressure, leaves the receiver through pipe '10 andgoes to the primary driers 9 and efiects the heatin of those driers, butto a lower temperature t an seconds mary driers 9 parts with heatandbecon es reduced in prfissure and thege dneli: g s- =cha throng ipes11 an 13, t 1s- 1 hiiugwitfidnwn by the suction device 12, the dischargeconsisting of the water at eonden mtion and air, and ssibly some lsteamthe motion device using, y,. ;muum-intheprimary less. The mmtmps 15open, as usual, in the presence of excessive water and form partillsells betm the primary driers and itho-ismtiondeviee and prevent theovernvherlmingpf the-suction device with steam from the driers. Thecondenser itserves -im eondenaingflle discharge firom the pritnarydiners, when those dricrs discharge receiver 7 is provided with a baflie7, as showman itsinlet firompi-pe Band its tmflst to'pipe 10, thishaflie preventing she direct low of steam between the two.

pipes and causing the water entrained in the discharged pipe 8 toseek-the lower :wtorfthe Receiver. The water in thebese of thomeimstands normally at the level 16, and when the level of water rises than1th. 'fleotwpene valve 17 and theeuction desicewithdmm water receiver.

1 Diaphragm 28 has its upper surfacesubtartBe-presaure-ofwthe steam inthe receiver and holds valve 21 normallycloaed, pgnsinst of action ofweight 25, ipe 19 being without nine under such con 'tions. If, however,the pressure in primary tails or is lost mtirely, as a result of theirown "action, then the ,mceiverm y-possibly cease to withdraw the waterand air, from the secondary driers. In such case the lowering of thepressure ir the receiver relieves the pressure over diaphragm 23;,whereupon valve 21 opens and permit the suction device 12 to drawdimdalyupon the receiver through pipe 19, same as if .the primary drierswere not in day a e suc no ice 12, iii-acting through p300 Hand 19,finds, in the weight of the 2 ve pro in check-valve 20, a slightresistance whereby the superior BIICHDQJsQXBDtQd on pipe 13 and theprimarydrier z9. v v

Bye'pas ns l5 enablef we suction device to he always flitting on theprimary driers 9 so as to remove steam, water of condensation, :and'airfrom those driersreven while the traps are not indicating that wateris 1. The steam in the prirs, while am; 19 m to be removed from thedrier-s, and the valves 15 are to be so regulated that the suctiondevicewill always draw sufficiently on the primary I have referred tothe grou of driers 9 as primary and the group 0 driers 4 as secondary,in view of the fact that in the drying of paper, for instance, it isusual to first subject thgzpaper to drying at the lower drying heat andsubsequently subject it to dryingahthe higher drying heat, the paper insuch case passing the driers in at the driers' 9 and te.su

While I- have illustrated my system as comprising but twogreupsofdriers, each grou containing two driers, each group may containany-desired and propel-number of driers, there maybe as many groups asdesiredQ-z and valve 21, with their accessries, -being disposed betweeneach two groups.

It is to understood that, even in the absence ofthe-traps '15, thevalves 15* serve in introducing a restriction between" the iiriers f9and the suction device, restriction servingto prevent theoverwlwlniingof the suction device by steam fi-om the suction device to'withdraw fromthe driers the water of condensation and airjin quantities as limited bythe restriction introduced in the pipes between the driers and thesuction device. i Y

1. A driersysteiucomprising, agr'oup of secondar diners, apipefor sIyingsteam thereto, a fieceiver, a pipe, aoi "the receiver incommunication wi h sai secondary driersr, a group Tof primary drier-s, apipe clog the receiver in communication with the primary driers, Motiondevice, a suctionpipe glad the suction deyice in communication wi h theprimary drier-s, a pipe placing the suctionudeviee vin communicationwith the base oivthe receiver, and a float valvewithin the Receiver onsaid last mentioned andr having its float adapted to open the valve byfile isc of accumulated ter in the receiver, combined substantially asset fulfill. 1

2. A drier system secondary drieraa pipe sapptyangsteam thereto, areceiver, a We placing; the receiver n communication with said.secondary drlers, a groupyilprimary thaws, a

' ing, a group of the direction of arrow 26, the paper being thussubjected to its primary dryingaction baeqaent drying at the secondarydriers 4.

pipe placing the receiver in communication with the primary, a suctiondevice, a suction-pipe placing-thesuetiomdevice in communication withthe primary drier-s, a pipe placing the suction device in communicationwith the base of the receiver, a valve 1 in said last-mentioned pipearranged to open by the-rise of the level of water in" the receiver,andsteam jtrapsdispos'ed between V j the primarydriers and the suction'device,

combined 'substantiallyas setforth.

. 3.;A drier system comprising,*agroupof secondary driers, a pipefor-supplying steam thereto r es-w p p p here- *ceiver in communicationwith said secondary clr1ers,-a'group of pr mary dr1ers,'a

pipe placing the receiver inycommunication with the primary driers, aSllCiilOIl devrce, a

cation with the base of' the'receivenand a condenser dISPOSBCl lIl thedischarge pipe between the primary driers and'the' suction device,combined substantially asset forth.

4. A drier system comprising, a group of secondary driers, a pipe forsupplying steam thereto, a receiver, a pipe placing the receiver incommunication with said secondary driers, a group of primary driers, a

pipe placing the receiver in communication.

with the primary driers, a suction device, a suction-pipe placing thesuction device in communication with the primary driers, a pipe placingthe suction device in communication with the base of the receiver, avalve in said last-mentioned pipe arranged to open by the rise of thelevel of waterin the receiver, steam traps disposed between the primarydriers and the suction device, bypass pipes at such steam traps, andregulating valves in such by-pass pipes, combined substantially as setforth.

5. A drier system comprising, a group of secondary driers, a pipe forsupplying steam thereto, a receiver, a pipe placing the receiver incommunication with said secondary driers, a group of primary driers, apipe placing the receiverin communication with the primary driers, asuction device, a suction-pipe placing the suction-device incommunication with the primary driers, a pipe placing the suction devicein communication with the base of the receiver,a float-valve in saidlast-mentioned pipe and arranged to be opened by the rising of the levelof the accumulated water in the receiver, a pipe placing thesuction-device in communication with the upper portion of the receiver,a normally closed valve in such pipe, a diaphragm connected with thestem of such valve and having one of its surfaces subjected to thepressure in the receiver, and a weight adapted to open such valve whenthe pressure over the diaphragm is reduced,

combined substantially as set forth.

6. A drier system comprising, a group of secondary driers, a pipe forsupplying steam thereto, a receiver, a pipe placing the re ceiver incommunication with said secondary driers, a group of primary driers, aplpe placing" the receiver in communication l with the" primary "drlers,a suction dev1ce, -a; su'ction-pipe placing the suction-device incommunication with'the primary drlers, aplpe placing the suction "devicecommunrcar 'tion with thebas'e of the receiver, fa fioat- "valve in saidlast-mentionedpipe and farrangedto be openedby thei rising of the levelof the accumulated waterin "the -receiv'er, a pipe placingthesuction-device-in" communication with the upper portion 'of thereceiver, a normally closed valve in such pipe, a diaphragm connectedwith the stem of such valve and having one o'f-its surfaces pressure ofthe diaphragm'is reduced, and

check-valve in said pipe placing the suction device in communicationwith the upper part of the receiver and adapted to furmary driers, asuction device, a pipe placin the suction device in communication w1ththe base of the receiver, a valveinsaid last-mentioned pipe arranged toopen by the rise of the level of water in the receiver,

[subjected to the pressureiin the'receiverfa means adapted to" open suchvalve when the the receiver in communication with the pripipes placingthe primary driers in com--.

munication with the. suction device, and restriction devices in saidlast mentioned pipes to limit the flow from-the driers to the suctiondevice, combined substantially as set forth.

8. A drier system comprising primaryand secondary groups of driers,meansffor supplying steam tosald secondarygroup,

'means for .withdrawing steam, a1r and water of condensation from saidsecondary group, means for separating the water from said steam and air,means for conducting the separated steam and air to said primary groupof driers, a common suction device for exhausting said primary group ofdriers and for withdrawing water from said separatingmeans and means forconnecting said. suction device with the steam spacein said separatingmeans when the pressure in said primary group of driers falls to apredetermined value; 7 r r 9. A drier system comprising primary andsecondary groups of driers, means for supplying steam to said secondarygroup,

means for withdrawing steam, air and water of condensation fromsaidsecondary group, means for separating the water from said steam and air,means for conducting the sep arated steam and air to said primary groupof driers, and a common suction device for

